1854080821 has 8 divisors (see below), whose sum is σ = 1889855064. Its totient is φ = 1818336000.

The previous prime is 1854080797. The next prime is 1854080849. The reversal of 1854080821 is 1280804581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 673402500 + 1180678321 = 25950^2 + 34361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1854080821 - 2¹⁷ = 1853949749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1854080881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153225 + ... + 164881.

It is an arithmetic number, because the mean of its divisors is an integer number (236231883).

Almost surely, 2^1854080821 is an apocalyptic number.

It is an amenable number.

1854080821 is a deficient number, since it is larger than the sum of its proper divisors (35774243).

1854080821 is a wasteful number, since it uses less digits than its factorization.

1854080821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14711.

The product of its (nonzero) digits is 20480, while the sum is 37.

The square root of 1854080821 is about 43059.0387839766. The cubic root of 1854080821 is about 1228.5029975554.

The spelling of 1854080821 in words is "one billion, eight hundred fifty-four million, eighty thousand, eight hundred twenty-one".